"And in this context you can appreciate the technical merits of monobloc barrels since in the case of a monobloc equipped double you retube rather than rebarrel, a process much less costly than rebarreling or sleeving."
Shotgun Lover. You have made this statement before and I'll agree with the rebarreling part but since the process of sleeving is much like the process of building a monobloc bbl set, given that you can't normally buy a profiled replacement monobloc tube from the original manufacturer, where is the cost saving in replacing damaged monobloc tubes over sleeving a set of chopper lump or dovetail lump bbls? For this discussion I'm assuming that both the monobloc bbls & the chopper lump/dovetail lump bbls have similar rib arrangements.
The only less costly part I can see with retubing a monobloc bbl set is that you don't have to machine the bbl stubs to receive the new tubes which is a relatively small part of the process. Otherwise you have much the same process of stripping & refitting ribs, profiling & fitting tubes, chambering finishing & on & on.
